A passenger elevator travels from the first floor to the 60th floor, a distance of 210m, in 35s. What is the elevator’s speed? A: 12m/s
B: 6m/s
C: 35m/s
D: 5m/s

Explanation:

manu's father is 24 years younger than manu's grandfather and 30 years older than him. The sum of ages of all the three persons is 144 years. find the age of each of him.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.